Year	Cases per 100,000
1990	9.76
1991	10.02
1992	9.9
1993	9.86
1994	9.97
1995	10.03
1996	9.94
1997	9.65
1998	9.28
1999	8.72
2000	7.97
2001	7.19
2002	6.48
2003	5.93
2004	5.43
2005	5
2006	4.73
2007	4.49
2008	4.34
2009	4.23
2010	4.16
2011	4.07
2012	3.96
2013	3.92
2014	3.86
2015	3.82
2016	3.79